Last time, we discussed some of the technical concerns of lens selection and the issues of compatibility with sensors of various configurations and sizes. In this part, we'll look at the effects sensor size has on photography and the engineering compromises behind lenses and sensors

This holiday we're re-running some of our most popular articles, in case you didn't see them the first time. Today: One day — soon — it may be possible to take almost perfect photos and videos with less-than-perfect lenses.